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Segment Information Summary of Real Estate Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Segment Reporting Information [Line Items] |  |  |  |
Operating properties | $ 4,477,857 us-gaap_RealEstateInvestmentPropertyAtCost |  | $ 4,603,692 us-gaap_RealEstateInvestmentPropertyAtCost |
Less: Assets held for sale | 136,802 us-gaap_RealEstateHeldforsale | [1] | 27,436 us-gaap_RealEstateHeldforsale | [1]
Construction-in-progress | 231,224 us-gaap_DevelopmentInProcess |  | 201,360 us-gaap_DevelopmentInProcess |
Land inventory | 90,945 us-gaap_LandAvailableForDevelopment |  | 90,603 us-gaap_LandAvailableForDevelopment |
Philadelphia CBD [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 1,346,858 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |  | 1,338,655 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_PhiladelphiaCbdMember |
Metropolitan Dc [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 1,189,601 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |  | 1,183,652 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_MetropolitanDcMember |
New Jersey/ Delaware [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 326,297 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember | [2] | 392,581 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_NewJerseyDelawareMember | [2]
Richmond, Virginia [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 317,422 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |  | 317,076 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_RichmondVirginiaMember |
Pennsylvania [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 1,178,408 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |  | 1,178,470 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = bdn_PennsylvaniaMember |
CALIFORNIA |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 119,271 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = stpr_CA | [2] | 193,258 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = stpr_CA | [2]
Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating properties | 4,614,659 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |  | 4,631,128 us-gaap_RealEstateInvestmentPropertyAtCost / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |
Assets Held-for-sale [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Less: Assets held for sale | 136,802 us-gaap_RealEstateHeldforsale / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AssetsHeldForSaleMember | [2] | 27,436 us-gaap_RealEstateHeldforsale / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AssetsHeldForSaleMember | [2]
Corporate Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Construction-in-progress | 231,224 us-gaap_DevelopmentInProcess / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | 201,360 us-gaap_DevelopmentInProcess / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
Land inventory | $ 90,945 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |  | $ 90,603 us-gaap_LandAvailableForDevelopment / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateMember |
[1] | Real estate investments related to assets held for sale above represents gross real estate assets and does not include accumulated depreciation or other assets on the balance sheets of the properties held for sale.
[2] | On December 31, 2014, the Company was actively marketing for sale its Atrium I and Libertyview properties, comprised of two office properties located in the New Jersey/Delaware segment. As of December 31, 2014 the properties were classified as held for sale on the consolidated balance sheet. The properties were sold on January 8, 2015. See Note 3, "Real Estate Investments," for further information. The sale is not classified as a significant disposition under the accounting guidance for discontinued operations. See Note 3, "Real Estate Investments," for further description of the five properties held for sale in the New Jersey/Delaware segment and one property held for sale in the California segment.

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- Definition Carrying amount of land available for development. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph d -Article 7 + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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